SN95 TB VS Fox TB dyno comparo.

Venom351R · Apr 26, 2010

I have a dyno apt today at 4:00 PM. While this comparison wont be under ideal conditions It's the best I can do in my situation. The dyno run's will be just about one year apart but it will be during the same time of year weather wise (first run was july of 09) but as we all know weather can change drastically from day to day let alone from one year prior. Last year when I went the weather was warm and sunny, today is going to be cool and cloudy w/ a chance of showers. I'm bringing up the weather topic b/c as we all know dyno #'s can change based on this so if my numbers are different by not that much we can probably notch it up to that. If not then perhaps there is more power to be had w/ the fox TB set up. I'll list my previous and current set up and I'll post the results w/ a graph once I get back later today.

Previous set up:

95MM Velocity meter, C&L pipe, Edelbrock/BBK 75MM Throttle Body,

Dyno numbers at this time, 338RWHP 342 RWTQ

Current Set up:

PMAS 95MM Velocity Meter, Anderson 4" Power Pipe, Accufab 75MM Thottle body

Dyno Numbers : Pending......

BlackVert · Apr 26, 2010

are those the only changes to your engine combo?

were there any other changes in the drivetrain, like gears?

Venom351R · Apr 26, 2010

I edited the first post. I forgot I had the car tetuned as well w/ the velocity meter and it put down a little more, also that was done back in july of last year.

I have 4.10's now, before I had 3.73's. I didnt think that would make a difference in power over all numbers though.

RatStang · Apr 26, 2010

Venom351R said:
I edited the first post. I forgot I had the car tetuned as well w/ the velocity meter and it put down a little more, also that was done back in july of last year.

I have 4.10's now, before I had 3.73's. I didnt think that would make a difference in power over all numbers though.

If it's a Mustang dyno, the gears really make no difference.

Venom351R · Apr 26, 2010

Its on a Dyno Jet 224 chassis dyno. Same dyno as before

RatStang · Apr 26, 2010

Not as certain about gear ratios on a dyno-jet. I've seen reference to software compensation for gear ratios on dyno-jets but don't know how accurate or uniform they are from one dyno to the next.

One reference I looked into suggested that gears have a much larger impact on HP numbers than they do on a Mustang dyno since dyno-jets measure HP based upon how quickly you get a known mass to X speed wheras the Mustang dyno applies additional (and variable) resistance throughout the pull to compensate for driveline.

alleymad95GT · Apr 26, 2010

Well, according to an article I found, numerically higher gears will actually REDUCE your hp on a chassis dyno. "Higher numerical gears tend to be more inefficient, so as gear ratios increase numerically, power levels tend to slightly drop, particularly on an inertia dyno." It goes on the explain why...

Chassis Dyno Guide - Transmissions And Final Drive Ratios - Hot Rod Magazine

Don't know how good that info is, but it is the first thing that popped up and seems to be a pretty thorough examination of the chassis dyno.

Venom351R · Apr 26, 2010

humm interesting stuff either way. Guess I'll just have to wait and see what the result is myself. I'll ask the tuner as well when I am there as far as if it makes a difference on his dyno

Killercanary · Apr 26, 2010

I'll be curious to see if you pickup the same I did when I did my test between the two.

RatStang · Apr 26, 2010

Killercanary said:
I'll be curious to see if you pickup the same I did when I did my test between the two.

What were your comparos and results?

Killercanary · Apr 26, 2010

DontGivaRatz said:
What were your comparos and results?

Here's the thread. The pics are gone as mustangmods went belly up and that was where I had all of my pictures hosted. The results were 9rwhp/5rwtq between a 65mm 94-95 setup with a ported elbow and a 75mm fox TB setup on the same dyno on the same day on my 331 combo.

http://www.stangnet.com/mustang-forums/753489-back-back-fox-versus-94-95-tb-dyno-results-inside.html

Edit, here is the pic that doesn't show up in the other thread:

My results:

GTA_V6_Mustang · Apr 26, 2010

Its not going to be a good comparison if a significant increase is noticed if at all. Because not only is it a different brand T/B but you also changed to that 4" power pipe. And killercanary you also went from a 65 to a 75 so that alone could have been the bigger difference.

Last5.0 · Apr 26, 2010

what intake do you have?

I can see getting a slight gain if you are currently using an intake elbow because those aren't actually "curved" like a stock '94/5 GT or Cobra intake, but usually angled with a sharp turn into the intake.

I'd like to see a same day comparison of a '94/5 Cobra (or stock) intake with a 65mm TB then swap to a fox style Cobra (or stock) intake and 65mm TB setup.

Venom351R · Apr 26, 2010

GTA_V6_Mustang said:
Because not only is it a different brand T/B but you also changed to that 4" power pipe.

Does not matter what brand throttle body it is, its the fact its the same size.

The change to the 4" power pipe goes along w/ the TB swap b/c its a comparison of of 94/95 set up to fox set up. Both set ups had the filter placed in the engine bay. This is not just for the "TB" aspect, its about the entire set up
http://en.wikipedia.org/wiki/Comparison_of_wiki_software

Venom351R · Apr 26, 2010

Killercanary said:
I'll be curious to see if you pickup the same I did when I did my test between the two.

I remember yours paul but also a lot of people crying foul b/c of the different size TB's and while mines not done on the same day as yours I did take out that aspect as far as different sizes.

ProKiller · Apr 26, 2010

people are always ready to call BS when its not their money they are spending on multiple dyno runs.....Any info you get is good info for anyone on the fence with the swap.

It does give me a thought though for something maybe i can talk to someone at work about.

Venom351R · Apr 26, 2010

Good point killer.

Im not just doing this to see the power difference but also b/c of the different air flow the engine is now getting its worth getting a retune anyway.

BlackVert · Apr 26, 2010

Venom351R said:
Does not matter what brand throttle body it is, its the fact its the same size.

i can not agree with you on this ... some throttle bodies are simply better than others. for example, a 75mm accufab TB will certainly flow better than a 75mm pro products TB

ProKiller · Apr 26, 2010

BlackVert said:
i can not agree with you on this ... some throttle bodies are simply better than others. for example, a 75mm accufab TB will certainly flow better than a 75mm pro products TB

what are you basing this on?

RIO5.0 · Apr 26, 2010

Travis...

I swapped TB's at Pete's and netted 2 HP from a Fox 65 to a Accu 75 ..
I would think you'd be around where Paul was..

SN95 TB VS Fox TB dyno comparo.

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